. Botany of the living plant. Botany. u. Fig. 360. I, Mucor mucedo, a sporangium in optical longitudinal section, c—columella. w!=wall of sporangium. s/»=spores. 2. Mucor mucilaginetis, a sporangium shedding its spores; the wall (m) is ruptinred, and the mucilaginous matrix (i) is grtally swollen. (After Brefeld. i x 225 ; 2 x 300, after v. Tavel.) (From Strasburgcr.) stalk, which has become turgid with sap under osmotic pressure. By the principle of the squirt this fluid is thrown out to a distance of some inches. carrying with it the sporangial head. A similar projection happens in Empiisa,
. Botany of the living plant. Botany. u. Fig. 360. I, Mucor mucedo, a sporangium in optical longitudinal section, c—columella. w!=wall of sporangium. s/»=spores. 2. Mucor mucilaginetis, a sporangium shedding its spores; the wall (m) is ruptinred, and the mucilaginous matrix (i) is grtally swollen. (After Brefeld. i x 225 ; 2 x 300, after v. Tavel.) (From Strasburgcr.) stalk, which has become turgid with sap under osmotic pressure. By the principle of the squirt this fluid is thrown out to a distance of some inches. carrying with it the sporangial head. A similar projection happens in Empiisa, but here it is only a single conidium that is discharged, * to any solid body, causes the halo previously mentioned. There is thus a considerable variety in the methods of dissemination in tlie Zygomycetes. The spores of many of the Mucorineae contain more than one nucleus. There are said to be two in Pilobolus, and many m Sporodinia. In the latter, which grows parasitically on large sapro* phytic species of Boletus, the sporangial head is first shut otl by a septum : this becomes convex, and forms the central columella. The large poly-nucleate mass of protoplasm filling the head then undergoes cleavage into a number of parts, each containing several nuclei. These rounding themselves off form the spores. Such cleavage of the contents of the sporangium is the typical method of formation of spores in the Mucorini. The final result is the same in all: viz. germination under favourable circumstances to form a new non-septate, and poly-nucleate Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan
Size: 1279px × 1954px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
